Catalytic cracking flue gas extractor

1. Before the other three units are accelerated, steam must be introduced into the smoke turbine; it cannot operate idly for long periods of time (except at the speed used for turning the shaft)； 2. In fact, the flue gas engine and the turbine can be connected simultaneously; if the conditions are not met, the flue gas engine should first be warmed up using steam according to a heating curve. Once the operation of the device becomes stable and the flue gas samples meet the required standards, then the flue gas can be heated further ； 3. When starting up the exhaust fan, it is necessary to control the heating rate carefully. At each temperature increase stage, check the expansion of various parts of the machine and pipelines, and closely monitor vibration and bearing temperature changes. Regularly measure the vibration of the bearing housing. I. Warming up the flue gas extractor 1) Activating the gas seal of the flue gas extractor ； 2) Feed wheel cooling steam into the flue gas extractor; at the same time, open the drain valve at the bottom of the unit to release any accumulated water, and then open it fully ； 3) Remove the water seal from the water seal tank at the exhaust of the smoke extractor; after manual turning of the unit operates normally, power the electric turning mechanism. 4) Warm the steam to around 200°C. II. Steps to start the flue gas extractor: 1) Once the reverse regeneration system is operating smoothly and the dust concentration in the flue gas is within acceptable levels, the flue gas extractor can be put into use ； 2) Open the dust removal line in front of the exhaust fan inlet valve to warm up the pipes, and pay close attention to observing and recording the expansion of the flue ； 3) Slowly open the flue gas extractor butterfly valve; the temperature of the flue gas extractor rises due to the leakage of flue gas (the temperature increase rate should not exceed 80°C/h) ； 4) Close the dust line valve before shutting off the valve, and close the machine’s drain valve ； 5) Slowly open the butterfly valve to increase the temperature; during this process, maintain the temperature at 300°C, 400°C, and 500°C for one hour each to check the expansion of the smoke extractor and whether all parameters are normal. 6) During the heating process, it is necessary to closely monitor and record the vibration of the smoke extractor unit itself as well as the inlet and outlet pipelines, as well as changes in displacement, expansion, and bearing temperature in various parts ； 7) When the pressure and temperature at the smoke extractor inlet reach the design parameters, stop opening the butterfly valve at the smoke extractor inlet ； 8) As the control butterfly valve opens, the pressure regulator automatically adjusts the opening degree of the double-acting slide valve to maintain a stable regeneration pressure.

It’s not that complicated; just make sure to keep the smoker at a slow heating rate and take your time. But it is necessary to conduct smoke analysis and other preparatory work in advance.

Pay attention to the heating rate: the steam temperature should not exceed 100 degrees in half an hour, and the flue gas temperature should not exceed 100 degrees after one hour of warming up. Before opening the gate valve of the flue gas system, it is essential to ensure that the regeneration pressure is appropriate and that the double-acting slide valve operates smoothly.